On Sept. 11, 2001, the core of al-Qaeda was concentrated in a single city: Karachi, Pakistan.

At a hospital, the accused mastermind of the bombing of the USS Cole was recovering from a tonsillectomy. Nearby, the alleged organizer of the 2002 bombing in Bali, Indonesia, was buying lab equipment for a biological weapons program. And in a safe house, the man who would later describe himself as the intellectual author of the Sept. 11 attacks was with other key al-Qaeda members watching the scenes from New York and Washington unfold on television....Within a day, much of the al-Qaeda leadership was on the way back to Afghanistan, planning for a long war.

A cache of classified military documents obtained by the anti-secrecy organization WikiLeaks presents new details of their whereabouts on Sept. 11, 2001, and their movements afterward. The documents also offer some tantalizing glimpses into the whereabouts and operations of Osama bin Laden and his Egyptian deputy, Ayman al-Zawahiri.

The documents, provided to European and U.S. news outlets, including The Washington Post, are intelligence assessments of nearly every one of the 779 individuals who have been held at Guantanamo Bay, Cuba, since 2002. In them, analysts have created detailed portraits of detainees based on raw intelligence, including material gleaned from interrogations.

Detainees are assessed “high,” “medium” or “low” in terms of their intelligence value, the threat they pose while in detention and the continued threat they might pose to the United States if released.